Laccainic Acid A.

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Structural formula
Structure laccainic acid A
General
Surname Laccainic Acid A.
other names
  • 7- [5- (2-Acetamidoethyl) -2-hydroxyphenyl] -3,5,6,8-tetrahydroxy-9,10-dioxo-9,10-dihydro-1,2-anthracenedicarboxylic acid ( IUPAC )
Molecular formula C 26 H 19 NO 12
Brief description

red powder

External identifiers / databases
CAS number 15979-35-8
PubChem 5491415
ChemSpider 4590519
Wikidata Q27162387
properties
Molar mass 537.43 g mol −1
Physical state

firmly

Melting point

180 ° C

safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

The laccaic A is an anthraquinone derivative and main component of red dye Lac Dye consisting of the lac insects is obtained. The mixture of Laccainsäuren A-E is also known as CI called Natural Red 25 (Natural Red 25).

Occurrence and use

Laccainic acid A is an anthraquinone dye that, like carminic acid or kermic acid, is obtained from scale insects .

Individual evidence

  1. ↑ a b Safety data sheet Lac Dye. (PDF) Kremer Pigments, October 12, 2015, accessed December 10, 2018 (German).
  2. ↑ Data sheet Naturrot 25 at Sigma-Aldrich , accessed on March 4, 2019 ( PDF ).
  3. ^ Lac Dye. materialarchiv.ch, accessed on December 10, 2018 .
  4. ↑ Mark C. Whiting: The dyes in early oriental carpets . In: Society of German Chemists (ed.): Chemistry in our time . 15th year, no. 6 . Verlag Chemie GmbH, Weinheim 1981, p. 179-189 .
  5. ↑ Perey Brigl: The chemical research into natural dyes . Springer Fachmedien, Wiesbaden 1921, ISBN 978-3-663-03907-5 , p. 43 ff . ( limited preview in Google Book search). doi : 10.1007 / 978-3-663-05096-4